Molding apparatus.



Patented June 27, I899.

F. KEPP 81. G. MESTA. MOLDING APPARATUS.

{Application filed Mar. 14, 1898.)

(No Model.)

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UNITED STATES PATENT OFFIC FERDINAND KEPP, OF ALLEGHENY, AND GEORGEMESTA, OF PITTSBURG,

PENNSYLVANIA.

MOLDING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 627,933, dated June 27,1899.

Application filed March 14, 1898.

T 0 all whom it may concern:

Be it known that we, FERDINAND KEPP, of Allegheny, and GEORGE MESTA, ofPittsburg, in the county of Allegheny and State of Pennsylvania, haveinvented a new and useful Improvement in Molding Apparatus, of which thefollowingis a full, clear, and exact description, reference being bad tothe accon1pany-' ing drawings, forming part of this specification, inwhich- Figure 1 is a side elevation, partly in section, showing one formof our improved apparatus; and Fig. 2 is a partial vertical sectionshowing the pattern in depressed position.

Our invention relates to the making of molded molds, andis designed toprovide an im proved apparatus whereby the pattern may be forced intothe sand of the mold, so as to quickly and easily form thematrix-cavity.

The invention may also be employed in making molds by tamping the sandaround the pattern, as one of the main points of the invention consistsin stripping-plates so arranged as to prevent injury to the mold uponthe withdrawal of the pattern.

In the drawings, 2 represents a suitable hollow base having a platform3, provided with a large central hole having a surrounding re-' cess 4,which receives astripper-plate 5. Wehave shown our invention as appliedto the manufactureofgear-wheels,andconsequently this stripper-plate isshaped so as to form a female die forthe pattern. The flask 6 rests uponthe stripper-plate outside the line of the teeth in this plate and maybe positioned thereon by dowel-pins and holes or any other suitablemeans for this purpose. Supported centrally above the stripper-plate isa motive cylinderv 7, carried on a standard 8, extending upwardly fromthe base 2. To the lower end of the piston-rod 9 of this cylinder issecured the pattern 10, which in the present-case is of the shape of agear-wheel, each tooth of which is provided with a downward wedge-shapedextension 11, the inclined sides of these extensions acting to force thesand laterallyin the mold and prevent breaking down of the central bodyof the sand.. Loosely surrounding the piston-rod above this pattern is asecond stripper-plate 12, which is of substantially the same shape asthe lower stripper-plate and Serial No. 673,687- (No model.)

which while the pattern is being forced down through the mold rests uponthe top of the pattern, being thrown out of registry therewith by aslight rotation around the pistonrod.

The operation is as follows: The mold being filled with sand, this sandis firmly packed in the flask in the usual manner, the flask ispositioned upon the lower stripper-plate, and the pattern, which may beheld in proper registry by a feather-and-spline connection 15 upon thepiston-rod or by suitable guides, is forced downwardly through the sanduntil the teeth proper of the pattern enterthe lower stripper-plate. Theupper stripper-plate is then rotated so as to register with the pattern,and is clamped to the top of the flask by any suitable mechanism, suchas the clamps 13. The pattern is then drawn upwardly through thestripper-plate, which holds the packed sand secnrelyin place, and assoon as the teeth proper have been drawn above the stripperplate it isreleased, pushed up over the pat tern, and again rotated, so as to restloosely thereon, as shown in Fig. 1. The upper stripper-plate may beprovided with a downwardlyprojecting ring 14, as shown in dotted linesin Fig. 1, and after the pattern has been forced down through the moldthis ring may be forced into the sand of the mold, so that thestripperplate will rest on the top of the mold, either by a wedge actionof the clamps or by any other suitable mechanism.

The advantages of our invention will be apparent to those skilled in theart, since a simple and effective mechanism is provided by means ofwhich the molds are quickly and easily formed without the use of skilledlabor. The wedge action of the pattern extension aids in packing thesand firmly in-place and preventing the breaking out of the middleportion of the sand, and the stripper-plates prevent injury to the moldboth in forcing the pattern into and drawing it from the sand.

I Many variations in the form and arrangement of the means for forcingthe pattern of the article desired, the stripper-platesbeingtcorrespondingl y changed.

We claim- 1. In a molding-machine, the combination with a flask-support,of a stripper-plate supported at one end of the flask and having a holeof irregular outline corresponding to the outline of the pattern, amovable stem or support carrying a pattern of irregular outline, thesaid support and the frame being so arranged that the pattern maybemoved out of contact with the strip per-plate, and means for holding thepattern in registry with the stripper-plate hole when out of contactwith said plate; substantially as described.

2. The combination with a flask-support, of stripper-plates supportedabove and below the flask and having holes of irregular outlinecorresponding to the outline of the pattern, a movable stem or supportcarrying a pattern of irregular outline, the said support and the framebeing so arranged that the pattern may be moved out of contact with thestripper-plates, and means for holding the pattern in registry with thestripper-plate holes when out of contact with said plates; substantiallyas described.

3. The combination with a flask-support, of a movable stem or supportcarrying an irregular pattern arranged to be forced into sand packed inthe flask, said pattern having a wedge-shaped extension, astripper-plate supported at one end of the flask and having a n V r627,933

hole of irregular outline corresponding to the pattern, the movablesupport and the frame being so arranged that the pattern may be movedout of contact with the stripper-plate, and means for holding thepattern in registry with the stripper-plate hole when out of contactwith said plate; substantially as described.

4. The combination with a flask-support arranged to receive a flaskfilled with packed sand, of removable stripper-plates above and belowthe flask having holes of irregular outline corresponding to the outlineof the pattern, a movable stem or support carrying a pattern ofirregular outline, and arranged to force the same through the packedsand, means for securing the upper stripper-plate in place after thepattern is forced into the flask, the movable support and the frame being so arranged that the pattern may be moved out of contact with thestripper-plates, and means for holding the pattern in registry with thestripper-plate holes when out of contact with said plates; substantiallyas described.

In testimony whereof we have hereunto set our hands.

FERDINAND KEPP. GEORGE MESTA.

